I discoverd she is cheating

I've been cheating since we got married 4 years ago... I have a married girlfried--two actually...and of course some Angel of the night now and again i even fantasise of a threesome with her and another man last time she read my whatsapp and noticed i was cheating... but she forgave me now...I got some proof that she is cheating with a guy doing a less paying job than me... On one side...i'm afaraid she might know/suspect about my married girlfred as we stay the same place and they once or twice shared taxi... and i can't leave my married girlfried...she is too sweeter to fuck! so.. Do i tell my wife that i know she is cheating or do i let her enjoy side-dick too?